Use your iPhone as a remote mouse, a trackpad, or even as a media remote for your Mac or PC

Of course, you’ll probably find an actual mouse or actual trackpad easier to use, but at least having the option to use your iPhone as a Magic Trackpad or a mouse in an emergency situation could save the day. With the Remote Mouse app, you’ll have multi-touch gestures, and you can even use the iPhone as a keyboard (complete with function keys in landscape mode) if you need to. The Remote Mouse app is $1.99. If you unlock with the Media Remote Panel for $1.99 more, you’ll be able to control iTunes, Keynote, Hulu, and FrontRow, or you can use the iPhone’s volume buttons to change Keynote slides during a presentation. The Remote Mouse app works on WiFi and 3G networks, and it’s compatible with Windows 8, 7, XP, Vista, Mac OSX 10.5+. You’ll need to install an app on your computer to use the Remote Mouse functions. Some of the other functions of Remote Mouse will require in-app purchases to unlock.